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you are plotting the freqs Fin+Flo and Flo-Fin.
for example:Fin=900MHz, Flo=1GHz, Fout=1.9GHz AND 100MHz.
Just add a filter at the output to filter out the unwanted freq.
I hope it can help
Mazz
Oh, I just haven't noticed that you are talking about QUADRATURE mixer.
I know what a quadrature mixer is. If properly driven it has to reject one sideband.
So in your case, supposing you are rejecting the lower sideband, the output frequency have to be 4.02 GHz only.
See this example:
This doesn't appear appear from the time domain signal you plot. But there is no time scale, so I cannot understand what signal really is.
If you send a schematic with also the IF and LO input signals, I can try to help you, otherwise I'm not able to do it.
Mazz
If you drive it properly (as you can see fro the previous attached plot), you have to see a sine wave at the output.
Be sure of:
-drive the linear port with a signal level below input compression point.
-drive le LO port with enough amplitude.
If you plot the signals in the freq domain you will be able to analyze better the steady state of the circuit.
I hop it can help.
Mazz
In spectreRF
PXF: to find correct indexes to work with.
Gain, noise figure: PSS (LO large signal) pac (as input signal), pnoise
P1dB: PSS (LO large signal, Input single tone Large signal), sweep input tone
IP3SS (LO large signal, Input double tones Large signal), sweep input tones.
I hope it can help.
Mazz
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